CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
0.4%
The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group.
Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID. (CVE-2018-13405)
Impact
Local users are able to create files with an unintended group ownership, allowing attackers to escalate privileges and obtain sensitive information that may aid in further attacks.
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from F5 Networks BIG-IP Solution K00854051.
#
# The text description of this plugin is (C) F5 Networks.
#
include('compat.inc');
if (description)
{
script_id(141516);
script_version("1.7");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/02");
script_cve_id("CVE-2018-13405");
script_name(english:"F5 Networks BIG-IP : Linux kernel vulnerability (K00854051)");
script_set_attribute(attribute:"synopsis", value:
"The remote device is missing a vendor-supplied security patch.");
script_set_attribute(attribute:"description", value:
"The inode_init_owner function in fs/inode.c in the Linux kernel
through 4.17.4 allows local users to create files with an unintended
group ownership, in a scenario where a directory is SGID to a certain
group and is writable by a user who is not a member of that group.
Here, the non-member can trigger creation of a plain file whose group
ownership is that group. The intended behavior was that the non-member
can trigger creation of a directory (but not a plain file) whose group
ownership is that group. The non-member can escalate privileges by
making the plain file executable and SGID. (CVE-2018-13405)
Impact
Local users are able to create files with an unintended group
ownership, allowing attackers to escalate privileges and obtain
sensitive information that may aid in further attacks.");
script_set_attribute(attribute:"see_also", value:"https://my.f5.com/manage/s/article/K00854051");
script_set_attribute(attribute:"solution", value:
"Upgrade to one of the non-vulnerable versions listed in the F5 Solution K00854051.");
script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:N/C:P/I:P/A:P");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2018-13405");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/06");
script_set_attribute(attribute:"patch_publication_date", value:"2019/05/09");
script_set_attribute(attribute:"plugin_publication_date", value:"2020/10/19");
script_set_attribute(attribute:"potential_vulnerability", value:"true");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_access_policy_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_advanced_firewall_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_acceleration_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_security_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_application_visibility_and_reporting");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_domain_name_system");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_global_traffic_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_link_controller");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_local_traffic_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_policy_enforcement_manager");
script_set_attribute(attribute:"cpe", value:"cpe:/a:f5:big-ip_webaccelerator");
script_set_attribute(attribute:"cpe", value:"cpe:/h:f5:big-ip");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"F5 Networks Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2020-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("f5_bigip_detect.nbin");
script_require_keys("Host/local_checks_enabled", "Host/BIG-IP/hotfix", "Host/BIG-IP/modules", "Host/BIG-IP/version", "Settings/ParanoidReport");
exit(0);
}
include('f5_func.inc');
if ( ! get_kb_item('Host/local_checks_enabled') ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var version = get_kb_item('Host/BIG-IP/version');
if ( ! version ) audit(AUDIT_OS_NOT, 'F5 Networks BIG-IP');
if ( isnull(get_kb_item('Host/BIG-IP/hotfix')) ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/hotfix');
if ( ! get_kb_item('Host/BIG-IP/modules') ) audit(AUDIT_KB_MISSING, 'Host/BIG-IP/modules');
if (report_paranoia < 2) audit(AUDIT_PARANOID);
var sol = 'K00854051';
var vmatrix = {
'AFM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'AM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'APM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'ASM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'AVR': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'DNS': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'GTM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'LC': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'LTM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'PEM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
},
'WAM': {
'affected': [
'16.0.0','15.1.0','15.0.0-15.0.1','14.0.0-14.1.3','13.0.0-13.1.3','12.1.0-12.1.5','11.5.2-11.6.5'
],
'unaffected': [
'16.1.0','16.0.1','15.1.1','15.0.1.4','14.1.3.1','13.1.3.5'
],
}
};
if (bigip_is_affected(vmatrix:vmatrix, sol:sol))
{
var extra = NULL;
if (report_verbosity > 0) extra = bigip_report_get();
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : extra
);
}
else
{
var tested = bigip_get_tested_modules();
var audit_extra = 'For BIG-IP module(s) ' + tested + ',';
if (tested) audit(AUDIT_INST_VER_NOT_VULN, audit_extra, version);
else audit(AUDIT_HOST_NOT, 'running any of the affected modules');
}
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
AI Score
Confidence
High
EPSS
Percentile
0.4%